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Theorem pm1.5 522
Description: Axiom *1.5 (Assoc) of [WhiteheadRussell] p. 96. (Contributed by NM, 3-Jan-2005.)
Assertion
Ref Expression
pm1.5

Proof of Theorem pm1.5
StepHypRef Expression
1 orc 385 . . 3
21olcd 393 . 2
3 olc 384 . . 3
43orim2i 518 . 2
52, 4jaoi 379 1
Colors of variables: wff setvar class
Syntax hints:  ->wi 4  \/wo 368
This theorem is referenced by:  or12  523  meran1  29876  meran3  29878
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8
This theorem depends on definitions:  df-bi 185  df-or 370
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